Performed leak detection and manifold tracing to determine which line was leaking. Found that the line leaking was the 3/4” copper on hot side of system that fed from behind downstairs master shower and came up behind secondary downstairs bathroom vanity. Recommend performing re route of this line to address leak. Performed re route of leaking 3/4” hot copper line located behind bathroom vanity, as well as re routing line from water heater over to downstairs shower. Also installed two new fill valves for toilets